Studi Perubahan Tutupan Lahan Berbasis Objek (Obia) Menggunakan Citra Satelit Di Kawasan Mangrove, Pulau Dompak, Provinsi Kepulauan Riau

Abstract

Berbagai ancaman pada hutan mangrove semakin meningkatkan kerentanan ekosistem itu sendiri. Dalam penelitian ini dilakukan monitoring mangrove menggunakan data penginderaan jauh. Penelitian ini bertujuan untuk mengkaji dan menganalisis perubahan tutupan mangrove di Pulau Dompak Provinsi Kepulauan Riau. Metode yang digunakan berupa klasifikasi citra satelit berbasis objek (OBIA) dengan algoritma support vector machine (SVM). Data citra satelit yang digunakan adalah SPOT 4 Tahun 2007 dan Sentinel 2B Tahun 2018 dengan resolusi spasial 10 x 10 m. Survey lapang dilakukan pada bulan September – Oktober 2018 dengan metode sampling secara acak. Hasil klasifikasi OBIA dengan algoritma SVM menghasilkan tingkat akurasi sebesar 89%, nilai kappa 0.86 dengan skala segmentasi optimum yang diperoleh adalah skala 3. Berdasarkan analisis perubahan tutupan lahan terjadi adanya penurunan luasan hutan mangrove sebesar 34.19% atau sekitar 46.61 ha sejak Tahun 2007 hingga 2018.

Carbon Stock Analysis in Mangrove Vegetation on Dompak Island, Riau Islands

“…In general, organic carbon stocks in Dompak Island are also higher than in the research conducted in Ujung Piring, Jepara, Central Java [14]. The total mangrove area in Dompak Island was reported to decrease from 136.31 to 89.7 ha in 11 years between 2007-2018 [4]. According to that study and vegetation carbon assessment results in this study, anthropogenic activities on Dompak Island caused 983.94 -3,823.2 ton/ha carbon loss.…”

“…Degradation of the mangrove ecosystem also occurs on Dompak Island. Mangrove forest area decreased by 34.19%, or around 46.61 ha, due to land conversion (office area, community housing, road construction, and supporting infrastructure) and logging from 2017-2018 [4]. Due to the loss, data related to carbon stock in Dompak Island has yet to be found.…”

“…Six species are from the Rhizophoraceae family, one from the Sonneratiaceae family and one from the Meliaceae family. A previous study reported that there are ten mangrove species on Dompak Island[7], while the identification results from a study conducted in 2021 found 14 mangrove species on Dompak Island[4]. Species frequency, dominance, density and Importance Value Index (IVI) of mangroves from each station are shown in…”

Shallow sea waters habitat mapping in 2018 and 2022 using Sentinel-2 Imagery with OBIA Method at Kelapa Dua Island, Seribu Island, Jakarta Province, Indonesia

“…The shape value is 0.1, and the compactness is 0.5 (default). The rule set parameter setting does not contain certain provisions, so it is adjusted to the repetition test process and gets the best results [17].…”

Mangrove Density Mapping from Landsat 8/9 OLI Imagery in Dompak Island, Indonesia: A Study from 2017 to 2022

“…As much as 27.6% of all mangrove vegetation in Tanjungpinang City is on Dompak Island [11]. This area experiencing massive urban development by the local government, which has resulted in large-scale felling of forests, which are then converted into office areas and housing, as well as the construction of infrastructure and roads, as well as other infrastructure [12,13]. A decline in its forest area can affect the species and its ecosystem condition.…”